Topic: SOLVED: si_490 - Daimler-Benz - 4 cyl boxer disc rotary valve - 1958

[fromwien]

Here is another exceptional engine.
With which manufacturer was it developed? How many cylinders and how were they arranged? What was the special design feature? When did development begin?
Edit: In this photo, the engine is partially disassembled.

Please excuse, but I think all questions you asked for are solved, despite "development begin", or am I wrong?
1) With which manufacturer was it developed? Daimler-Benz
2) How many cylinders and how were they arranged? 4-cylinder, flat
3) What was the special design feature? Rotary valve
4) When did development begin? Only unanswered question in my mind 

[sichel]

Sorry, please unlock. I would like to leave the puzzle-solution to other players. I am focused on much more important things in life. Have hardly any interest or time for AutoPuzzles activities. Sorry, once more 

OK. Unlocked

[sichel]

Here is another exceptional engine.
With which manufacturer was it developed? How many cylinders and how were they arranged? What was the special design feature? When did development begin?
Edit: In this photo, the engine is partially disassembled.

Please excuse, but I think all questions you asked for are solved, despite "development begin", or am I wrong?
1) With which manufacturer was it developed? Daimler-Benz
2) How many cylinders and how were they arranged? 4-cylinder, flat
3) What was the special design feature? Rotary valve
4) When did development begin? Only unanswered question in my mind 

The task would be completely answered by naming the start of the development. However, it would be interesting to find out in what context the development began and why it ended.

[oko94]

Was this engine built in the sixties ?

[sichel]

Even in the 60s.

[fromwien]

Yes, it was built by Daimler-Benz. Blocked for five attempts to describe the unit in more detail.

Here is another exceptional engine.
With which manufacturer was it developed? How many cylinders and how were they arranged? What was the special design feature? When did development begin?
Edit: In this photo, the engine is partially disassembled.

Please excuse, but I think all questions you asked for are solved, despite "development begin", or am I wrong?
1) With which manufacturer was it developed? Daimler-Benz
2) How many cylinders and how were they arranged? 4-cylinder, flat
3) What was the special design feature? Rotary valve
4) When did development begin? Only unanswered question in my mind 

The task would be completely answered by naming the start of the development. However, it would be interesting to find out in what context the development began and why it ended.

Oh dear, why did you change the solving requirements suddenly?

[fromwien]

1500ccm-4 cylinder-flat-engine for W118, 1960/61
End of the 1950s Daimler-Benz took over Auto-Union company and wanted to expand their product range with a smaller front-wheel-drive car. They saw no development-future in the Auto-Union two-stroke engine. Chief engineer of the prototype: Ludwig Kraus. Daimler-Development chief: Fritz Nallinger
However, smooth running and fuel consumption did not meet Nallinger's expectations, further development of the 4-cylinder-flat-engine has been stopped

[sichel]

The development of this project began before 1960, what year was it?
We can communicate the details of the project when the puzzle is solved.

[fromwien]

Unfortunately I was not able to find the book “Mercedes Benz Rarities” in my library. I just remember the W118 article only a little:
At Mercedes Benz they started immediately after the take-over of Auto-Union company with the development of a four-stroke-model in Stuttgart, while at Auto-Union, they still believed passionately in the two-stroke-future. So 1958?
Have found the article about "Mercedes and Auto-Union". There was mentioned, that Ludwig Kraus and team worked at Mercedes for compact prototypes (W122 and W118) from 1953 on. I don't know, if the development of the 4cylinder-flat started at the same time? 1953?

[sichel]

Too bad, without the deletion of the first attempt I would have rated the puzzle as solved ;-), but so I have to wait a little longer...

[fromwien]

Thought about, that the puzzle must be sichel-typical one step further tricky.
So here once again the remembering out of my brains (mostly the first idea is the best one)

At Mercedes Benz they started immediately after the take-over of Auto-Union company with the development of a four-stroke-model in Stuttgart, while at Auto-Union, they still believed passionately in the two-stroke-future. So 1958?

[sichel]

There you go :-). The next point is for 1958.
A few words about the development:
The puzzle engine was intended for a Type 190. It is not clear from my source exactly which model was meant (W122, W118, W119 or even W110).
The engine was a four-cylinder, four-stroke boxer engine with rotary valve control. Displacement 1.9 litres, 72 hp at 3800 rpm.
The project was headed by W.-D. Bensinger (head of the car engine design department). Bensinger developed slide valve-controlled aircraft engines in the 1940s (DB600).
These were, of course, ideal conditions for this project. Test bench trials were carried out from 1960 to 1962.
From the mid-1930s, Bensinger had close contact with Felix Wankel. At the time, Wankel was researching the sealing of rotary valves in aircraft engines...
Bensinger was one of the first guests to see Wankel's rotary engine in operation on the test bench in 1957. He followed the further development of Wankel's designs closely. This led to a licence agreement with NSU/Wankel in 1961. Bensinger and his team implemented the contract, resulting in the C111 engine.
According to Bensinger, the development also had the following aspect: "It allowed my team to train for sealing."

[fromwien]

Thank you for puzzle and point 

[fromwien]

By the way just a technical question, which made me headaches: How should the sealing-issue be solved with this valve design?

[sichel]

The answer will take some time. I have to look for, find and study sources. That also applies to si_517.